ACCURATE MEASUREMENTSReliable measurement range from 0.04 to 50m / 165ft. Measurement accuracy: 2mm. Change four units with one button: m / ft / in / ft + in; Thanks to the advanced 2-bubble leveling, for precise vertical and horizontal alignment of the laser. use 2 reference points to select the front or back edge of the device as the starting point for measurement, the measurement data is more accurate. (indirect measurement); Continuous measurement function + Auto sum function. Maximum and minimum values at the push of a button. Ideal for home, construction and industry, especially in large areas such as apartments, buildings, real estate, factories, warehouses, construction and industries. LARGE LCD BACKLIGHT MUTE SWITCH Super large backlight screen provides users with better visibility. mute function suppress the beep sound in quiet environments (libraries, class); 20 sets of data memory recall function for verification and calculation; Automatic shutdown after no operation at 180s to save energy. NON-SLIP PORTABLEIP54 dustproof and waterproof ensure maximum protection in harsh working conditions. Non-slip design: Wrapped with soft rubber good grip, wrist strap provided to prevent slipping. It can be easily put in a gift bag Continuous and Pythagorean measurement and single distance, using the Pythagorean theorem (a2 + b2 = c2). Calculate the area of a square or rectangular room or space by measuring its length and width and multiplying the two values. Based on measured length, width and height, allows you intelligent volume and area calculations, no need for manual operation anymore. Quick measurement in 0.5s With 2 photosensitive holes and large optical lens , the light transmission is increased by 50% and the response time is 0.5s during measurement, it is better able to withstand strong light interference and can still be read clearly under external sunlight, which provides more stable and accurate measurement than other laser measurement. 4 units conversion Press and hold Units button for 2 seconds to freely change units to M/In/Ft/Ft+in , which can meet your different measurement needs. IP54 and 2 bubble levels Features IP54 waterproof level, protect the laser distance measure normally to the maximum, which provides a variety of environmental work to use. Small body with 2 spirit levels fits in your hand, gives you accurate measurement and you can put it in your pocket or take it anywhere.